<!--
 * Tencent is pleased to support the open source community by making BK-JOB蓝鲸智云作业平台 available.
 *
 * Copyright (C) 2021 THL A29 Limited, a Tencent company.  All rights reserved.
 *
 * BK-JOB蓝鲸智云作业平台 is licensed under the MIT License.
 *
 * License for BK-JOB蓝鲸智云作业平台:
 *
 *
 * Terms of the MIT License:
 * ---------------------------------------------------
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
 * documentation files (the "Software"), to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and
 * to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of
 * the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
 * THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
 * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
-->

<template>
    <div
        class="job-textarea"
        :class="{
            fouced: isFocused,
        }"
        :style="boxStyles">
        <div ref="wraper" class="job-textarea-wraper" :style="wraperStyles">
            <div style="min-height: 30px; word-break: break-all; white-space: pre-wrap; visibility: hidden;">{{ localValue }}</div>
            <textarea
                ref="textarea"
                class="job-textarea-edit"
                spellcheck="false"
                resize="none"
                :value="localValue"
                @input="handleInputChange"
                @focus="handleInputGetFocus"
                @blur="handleBlur" />
            <div v-if="maxlength > 0 && isFocused" class="value-length">
                <span style="color: #63656e;">{{ localValue.length }}</span>
                <span>/</span>
                <span>{{ maxlength }}</span>
            </div>
        </div>
        <div
            v-if="showPlaceholder"
            class="job-textarea-placeholder"
            @click="handleInputGetFocus">
            {{ placeholder }}
        </div>
    </div>
</template>
<script>
    const rowHeight = 18;

    export default {
        name: '',
        props: {
            value: {
                type: String,
                default: '',
            },
            placeholder: String,
            resize: {
                type: Boolean,
                default: false,
            },
            // 默认展示多少行
            rows: {
                type: Number,
                default: 1,
            },
            maxlength: Number,
        },
        data () {
            return {
                localValue: this.value,
                isFocused: false,
            };
        },
        computed: {
            boxStyles () {
                const styles = {};
                const defaultHeight = this.rows * rowHeight + 12;
                styles.height = `${defaultHeight}px`;
                return styles;
            },
            wraperStyles () {
                const styles = {
                    // eslint-disable-next-line no-underscore-dangle
                    zIndex: window.__bk_zIndex_manager.nextZIndex(),
                };
                
                if (!this.isFocused) {
                    styles['max-height'] = '100%';
                }
                return styles;
            },
            showPlaceholder () {
                if (this.isFocused) {
                    return false;
                }
                return !this.localValue;
            },
        },
        methods: {
            /**
             * @desc 输入框聚焦
             */
            focus () {
                this.$refs.textarea.focus();
            },
            /**
             * @desc 输入框获得焦点
             */
            handleInputGetFocus () {
                this.isFocused = true;
                setTimeout(() => {
                    this.$refs.textarea.selectionStart = this.localValue.length;
                    this.$refs.textarea.selectionEnd = this.localValue.length;
                });
            },
            /**
             * @desc 用户输入
             */
            handleInputChange (event) {
                let localValue = event.target.value.trim();
                if (this.maxlength > 0 && localValue.length > this.maxlength) {
                    localValue = localValue.slice(0, this.maxlength);
                    this.$nextTick(() => {
                        this.$refs.textarea.value = localValue;
                    });
                }
                this.localValue = localValue;
                this.$emit('input', this.localValue);
                this.$emit('change', this.localValue);
            },
            /**
             * @desc 输入框失焦
             */
            handleBlur () {
                this.isFocused = false;
                this.$emit('blur', this.localValue);
            },
        },
    };
</script>
<style lang='postcss'>
    @import '@/css/mixins/scroll';

    .job-textarea {
        position: relative;
        font-size: 12px;
        line-height: 18px;
        word-break: break-all;
        cursor: pointer;

        .job-textarea-wraper {
            position: absolute;
            top: 0;
            right: 0;
            left: 0;
            z-index: 1999;
            max-height: 300px;
            min-height: 100%;
            padding-bottom: 20px;

            .value-length {
                position: absolute;
                right: 20px;
                bottom: 6px;
                display: flex;
                color: #979ba5;
                cursor: default;
                background: inherit;
                border-radius: 8px;
                user-select: none;
            }
        }

        .job-textarea-edit {
            position: absolute;
            top: 0;
            right: 0;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 100%;
            padding: 6px 10px 0;
            overflow-y: scroll;
            font-size: 12px;
            color: #63656e;
            background: #fff;
            border: 1px solid #c4c6cc;
            border-radius: 2px;
            outline: none;
            resize: none;

            &:focus {
                padding-bottom: 30px;
                background: #fff !important;
                border: 1px solid #3a84ff !important;
            }

            @mixin scroller;
        }

        .job-textarea-placeholder {
            position: absolute;
            top: 1px;
            right: 1px;
            bottom: 1px;
            left: 1px;
            height: 30px;
            padding: 6px 10px;
            overflow: hidden;
            color: #c4c6cc;
            text-overflow: ellipsis;
            white-space: nowrap;
            background: inherit;
        }
    }
</style>
